–VS +VS G = 100
參數(shù)資料
型號(hào)： AD624SD
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/17頁(yè)
文件大?。?/td> 0K
描述： IC AMP INST 25MHZ PREC LN 16CDIP
標(biāo)準(zhǔn)包裝： 1
放大器類型： 儀表
電路數(shù)： 1
轉(zhuǎn)換速率： 5 V/µs
增益帶寬積： 25MHz
-3db帶寬： 1MHz
電流 - 輸入偏壓： 50nA
電壓 - 輸入偏移： 75µV
電流 - 電源： 3.5mA
電壓 - 電源，單路/雙路(±)： ±6 V ~ 18 V
工作溫度： -55°C ~ 125°C
安裝類型： 通孔
封裝/外殼： 16-CDIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 16-CDIP 側(cè)面銅焊
包裝： 管件
REV. C
AD624
–14–
AD624C
–VS
+VS
G = 100
RG1
RG2
10k
350
+10V
14-BIT
ADC
0 TO 2V
F.S.
350
Figure 47. Typical Bridge Application
Table II. Error Budget Analysis of AD624CD in Bridge Application
Effect on
Absolute
Effect
AD624C
Accuracy
on
Error Source
Specifications
Calculation
at TA = +25 C
at TA = +85 C Resolution
Gain Error
±0.1%
±0.1% = 1000 ppm
1000 ppm
–
Gain Instability
10 ppm
(10 ppm/
°C) (60°C) = 600 ppm
_
600 ppm
–
Gain Nonlinearity
±0.001%
±0.001% = 10 ppm
––
10 ppm
Input Offset Voltage
±25 V, RTI
±25 V/20 mV = ±1250 ppm
1250 ppm
–
Input Offset Voltage Drift
±0.25 V/°C(±0.25 V/°C) (60°C)= 15 V
15
V/20 mV = 750 ppm
–
750 ppm
–
Output Offset Voltage
1
±2.0 mV
±2.0 mV/20 mV = 1000 ppm
1000 ppm
–
Output Offset Voltage Drift
1
±10 V/°C(±10 V/°C) (60°C) = 600 V
600
V/20 mV = 300 ppm
–
300 ppm
–
Bias Current–Source
±15 nA
(
±15 nA)(5 ) = 0.075 V
Imbalance Error
0.075
V/20mV = 3.75 ppm
3.75 ppm
–
Offset Current–Source
±10 nA
(
±10 nA)(5 ) = 0.050 V
Imbalance Error
0.050
V/20 mV = 2.5 ppm
2.5 ppm
–
Offset Current–Source
±10 nA
(10 nA) (175
) = 1.75 V
Resistance Error
1.75
V/20 mV = 87.5 ppm
87.5 ppm
–
Offset Current–Source
±100 pA/°C
(100 pA/
°C) (175 ) (60°C) = 1 V
Resistance–Drift
1
V/20 mV = 50 ppm
–
50 ppm
–
Common-Mode Rejection
115 dB
115 dB = 1.8 ppm
× 5V = 9 V
5V dc
9
V/20 mV = 444 ppm
450 ppm
–
Noise, RTI
(0.1 Hz–10 Hz)
0.22
V p-p
0.22
V p-p/20 mV = 10 ppm
_
–
10 ppm
Total Error
3793.75 ppm
5493.75 ppm
20 ppm
NOTE
1Output offset voltage and output offset voltage drift are given as RTI figures.
For a comprehensive study of instrumentation amplifier design
and applications, refer to the Instrumentation Amplifier Application
Guide, available free from Analog Devices.
ERROR BUDGET ANALYSIS
To illustrate how instrumentation amplifier specifications are
applied, we will now examine a typical case where an AD624 is
required to amplify the output of an unbalanced transducer.
Figure 47 shows a differential transducer, unbalanced by
≈5 ,
supplying a 0 to 20 mV signal to an AD624C. The output of the
IA feeds a 14-bit A to D converter with a 0 to 2 volt input volt-
age range. The operating temperature range is –25
°C to +85°C.
Therefore, the largest change in temperature
T within the
operating range is from ambient to +85
°C (85°C – 25°C =
60
°C.)
In many applications, differential linearity and resolution are of
prime importance. This would be so in cases where the absolute
value of a variable is less important than changes in value. In
these applications, only the irreducible errors (20 ppm =
0.002%) are significant. Furthermore, if a system has an intelli-
gent processor monitoring the A to D output, the addition of an
autogain/autozero cycle will remove all reducible errors and may
eliminate the requirement for initial calibration. This will also
reduce errors to 0.002%.
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